You don't need hdmi out, just ability to do screenshots, which easy to script.
Arguably though, browser automation gets you 95% of the way there for most things.
Many systems won't allow the end user to install any software (e.g. work issued laptops), but you can plug in HDMI and USB.
Many systems won't allow the end user to install any software (e.g. work issued laptops), but you can plug in HDMI and USB.